Hi Eng
I guess you have sorted this out now as it was a couple of weeks ago?
I would say that unexpected drops in BG are normal when start any new exercise regime that you are not used to.
Then you have taken carbs to compensate for the lows, causing the rebound effect.
So what I have found for these situations is that the following advice from DSNs works:
- expect lows when starting exercise or increasing your level of exercise significantly
- treat lows conservatively with just a few Glucotabs. Over correcting can set off swings, oscillations, as seen in your data
- don't correct strongly for highs arising from hypo correction, or after exercise, and especially both. This is the hardest advice for me to follow, it goes against instinct, but it's true.
The reason why is, after a hypo and after exercise, your body does glycogen replacement. This process pulls glucose out of the bloodstream for several hours, until the glycogen reserves in the liver and muscles are topped up again. The glycogen reserves are depleted during exercise and particularly during a hypo (particularly if you get adrenalin symptoms). The effect is particularly noticeable the first time you exercise and eases off once your body gets used to regular exercise.
If you combine these suggestions you should be fine with exercise. Reducing basal may also help somewhat, but keep in mind there is a delivery delay into the bloodstream from the skin just like with MDI. But if you reduce basal during the exercise, the blood glucose effect will be after the exercise, which is typically when you need it (because glycogen replenishment is driving blood glucose down, so you want less insulin in the blood).
Exercise and hypos used to really mess me about until I understood all this, actually believed it, and put it all together.
If you were just going regular exercise it would just be a matter of tweaking your basal. But because you are changing your level of exercise is what introduces these oscillations. In engineering terms: It's like any disturbance to a stable system introduces oscillations. You need to "damp down" the oscillations. Making moderate glucose corrections and then minimal insulin corrections to those glucose corrections, you can damp down the oscillations.
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